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Subject[RFC v4 11/25] m68k/atari: Implement arch_nvram_ops methods and enable CONFIG_HAVE_ARCH_NVRAM_OPS
Atari RTC NVRAM has a checksum so implement the remaining arch_nvram_ops
methods for the set_checksum and initialize ioctls. Enable
CONFIG_HAVE_ARCH_NVRAM_OPS.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>

---

This re-enables the nvram module for Atari.

Changes since v3:
- Use bool (and select) instead of def_bool in the definition of the
HAVE_ARCH_NVRAM_OPS Kconfig symbol, as requested by Geert.

---
arch/m68k/Kconfig | 3 +++
arch/m68k/Kconfig.machine | 1 +
arch/m68k/atari/nvram.c | 24 ++++++++++++++++++++++++
drivers/char/Kconfig | 2 +-
4 files changed, 29 insertions(+), 1 deletion(-)

Index: linux/arch/m68k/atari/nvram.c
===================================================================
--- linux.orig/arch/m68k/atari/nvram.c 2015-07-12 20:24:58.000000000 +1000
+++ linux/arch/m68k/atari/nvram.c 2015-07-12 20:25:05.000000000 +1000
@@ -73,6 +73,26 @@ static void __nvram_set_checksum(void)
__nvram_write_byte(sum, ATARI_CKS_LOC + 1);
}

+static long nvram_set_checksum(void)
+{
+ spin_lock_irq(&rtc_lock);
+ __nvram_set_checksum();
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+}
+
+static long nvram_initialize(void)
+{
+ loff_t i;
+
+ spin_lock_irq(&rtc_lock);
+ for (i = 0; i < NVRAM_BYTES; ++i)
+ __nvram_write_byte(0, i);
+ __nvram_set_checksum();
+ spin_unlock_irq(&rtc_lock);
+ return 0;
+}
+
static ssize_t nvram_read(char *buf, size_t count, loff_t *ppos)
{
char *p = buf;
@@ -119,6 +139,8 @@ static ssize_t nvram_write(char *buf, si

static ssize_t nvram_get_size(void)
{
+ if (!MACH_IS_ATARI)
+ return -ENODEV;
return NVRAM_BYTES;
}

@@ -126,6 +148,8 @@ const struct nvram_ops arch_nvram_ops =
.read = nvram_read,
.write = nvram_write,
.get_size = nvram_get_size,
+ .set_checksum = nvram_set_checksum,
+ .initialize = nvram_initialize,
};
EXPORT_SYMBOL(arch_nvram_ops);

Index: linux/drivers/char/Kconfig
===================================================================
--- linux.orig/drivers/char/Kconfig 2015-07-12 20:24:54.000000000 +1000
+++ linux/drivers/char/Kconfig 2015-07-12 20:25:05.000000000 +1000
@@ -247,7 +247,7 @@ source "drivers/char/hw_random/Kconfig"

config NVRAM
tristate "/dev/nvram support"
- depends on X86 || (ARM && RTC_DRV_CMOS) || GENERIC_NVRAM
+ depends on X86 || (ARM && RTC_DRV_CMOS) || GENERIC_NVRAM || HAVE_ARCH_NVRAM_OPS
---help---
If you say Y here and create a character special file /dev/nvram
with major number 10 and minor number 144 using mknod ("man mknod"),
Index: linux/arch/m68k/Kconfig
===================================================================
--- linux.orig/arch/m68k/Kconfig 2015-07-12 20:24:53.000000000 +1000
+++ linux/arch/m68k/Kconfig 2015-07-12 20:25:05.000000000 +1000
@@ -71,6 +71,9 @@ config PGTABLE_LEVELS
default 2 if SUN3 || COLDFIRE
default 3

+config HAVE_ARCH_NVRAM_OPS
+ bool
+
source "init/Kconfig"

source "kernel/Kconfig.freezer"
Index: linux/arch/m68k/Kconfig.machine
===================================================================
--- linux.orig/arch/m68k/Kconfig.machine 2015-07-12 20:24:53.000000000 +1000
+++ linux/arch/m68k/Kconfig.machine 2015-07-12 20:25:05.000000000 +1000
@@ -15,6 +15,7 @@ config ATARI
bool "Atari support"
depends on MMU
select MMU_MOTOROLA if MMU
+ select HAVE_ARCH_NVRAM_OPS
help
This option enables support for the 68000-based Atari series of
computers (including the TT, Falcon and Medusa). If you plan to use



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